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Cystic fibrosis
Definition: An hereditary condition resulting from a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
Epidemiology • The predominant fatal genetic disorder among European people. Approximately 1 in 2,500 infants born in the United Kingdom (UK) are diagnosed with cystic fibrosis (CF). Genetics: Inherited in an autosomal recessive fashion. The CFTR gene is located on chromosome 7q and encodes a chloride ion channel. More than 1,400 variants have been identified, with the most prevalent being a deletion at position 508 that results in the loss of a phenylalanine amino acid (the ZF508 mutation). The ZF508 mutation induces improper folding of the CFTR protein, leading to its breakdown within the cell. • Alternative mutations may yield a properly situated protein, however with dysfunctional activity. The absence of normal CFTR leads to impaired electrolyte transport across epithelial cell membranes, leading in the production of viscous mucus discharges.
Presentation • The majority of patients exhibit lung illness resulting from recurrent infections. Initially, typical bacteria inhabit the lungs; nevertheless, Pseudomonas aeruginosa frequently emerges as the predominant organism. Additionally, pancreatic insufficiency is prevalent. • Bowel obstruction might arise during the newborn period due to thick meconium (meconium ileus) or manifest later in childhood. • Liver illness manifests at a later stage. • Certain cases may be identified when elevated serum immunoreactive trypsin is detected during newborn screening.
Macroscopy • Lungs from older children typically have extensive bronchiectasis. • The liver may present with steatosis and, in severe instances, may be cirrhotic. Histopathology The lungs exhibit bronchiectatic airways filled with viscous mucus. Acute inflammation may occur in the presence of an active infection. The liver has thickened bile within the intrahepatic bile ducts. Periportal fibrosis may occur, which can advance to cirrhosis in more severe instances.
Prognosis: The average lifespan is presently approximately 35 years. • The majority of individuals succumb to pulmonary illness.
Definition: An hereditary condition resulting from a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
Epidemiology • The predominant fatal genetic disorder among European people. Approximately 1 in 2,500 infants born in the United Kingdom (UK) are diagnosed with cystic fibrosis (CF). Genetics: Inherited in an autosomal recessive fashion. The CFTR gene is located on chromosome 7q and encodes a chloride ion channel. More than 1,400 variants have been identified, with the most prevalent being a deletion at position 508 that results in the loss of a phenylalanine amino acid (the ZF508 mutation). The ZF508 mutation induces improper folding of the CFTR protein, leading to its breakdown within the cell. • Alternative mutations may yield a properly situated protein, however with dysfunctional activity. The absence of normal CFTR leads to impaired electrolyte transport across epithelial cell membranes, leading in the production of viscous mucus discharges.
Presentation • The majority of patients exhibit lung illness resulting from recurrent infections. Initially, typical bacteria inhabit the lungs; nevertheless, Pseudomonas aeruginosa frequently emerges as the predominant organism. Additionally, pancreatic insufficiency is prevalent. • Bowel obstruction might arise during the newborn period due to thick meconium (meconium ileus) or manifest later in childhood. • Liver illness manifests at a later stage. • Certain cases may be identified when elevated serum immunoreactive trypsin is detected during newborn screening.
Macroscopy • Lungs from older children typically have extensive bronchiectasis. • The liver may present with steatosis and, in severe instances, may be cirrhotic. Histopathology The lungs exhibit bronchiectatic airways filled with viscous mucus. Acute inflammation may occur in the presence of an active infection. The liver has thickened bile within the intrahepatic bile ducts. Periportal fibrosis may occur, which can advance to cirrhosis in more severe instances.
Prognosis: The average lifespan is presently approximately 35 years. • The majority of individuals succumb to pulmonary illness.
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